Okay, so I am in the middle of building the Dumas Prime Time, and the instructions say to cut out slots in the bottom of the hull, and glue on a wooden keel from the bow to stern. What purpose does this serve? The kit is supposed to be a twin screw with rudders, but I am modifying the hull to accommodate a twin jet configuration (just like the full size one, which incidentally does not have a big exterior keel hanging down). Is a keel really necessary?

I understand that a keel is to keep the vessel from going sideways in the water, but shouldn't this only apply to sailing vessels?

Thank you.
-Christopher C. Keeler